May I suggest matrix.org... "Matrix is an open standard for decentralised communication...You can use Matrix for...Decentralised Group Chat (Fully distributed p

May I suggest matrix.org... "Matrix is an open standard for decentralised communication...You can use Matrix for...Decentralised Group Chat (Fully distributed persistent chatrooms with no single points of control or failure)...WebRTC Signalling (Web-friendly signalling transport for interoperable VoIP and video calling)...Internet of Things (Exchanging and persisting data between devices and services)...and anywhere else you need a common data fabric to link together fragmented silos of communication." For protocol info, see http://matrix.org http://matrix.org For seeing how it works, check out https://riot.im https://riot.im (only one of the numerous federated home servers, and only one of the chat clients). Or, better yet, host your own home (public or private) server across the matrix network! ;-)